Problem: 51MB partition max size on jffs2

Dave Ellis DGE at
Wed Dec 4 13:44:54 EST 2002

On Wednesday 04 December 2002 17:54, Ken Offer wrote:
> I've got a Toshiba 128MB Smart Card in my embedded system and I wrote a 
> custom nand driver to support it.  I have discovered that I cannot 
> mount a jffs2 partition larger than 51MB on the card (so at this point 
> I have two 51MB partitions and 1 26MB partition).  Trying to mount a 
> larger partition yields a less than helpful error message from mount.  

I had the same problem a few weeks ago, and this patch seems
to solve it:

--- dist/fs/jffs2/build.c	Mon Sep  9 12:29:08 2002
+++ curr/fs/jffs2/build.c	Mon Nov 18 14:18:29 2002
@@ -211,7 +211,8 @@
 	c->free_size = c->flash_size;
 	c->nr_blocks = c->flash_size / c->sector_size;
-	c->blocks = kmalloc(sizeof(struct jffs2_eraseblock) * c->nr_blocks,
+	/* kmalloc fails for large NAND since can't get more than 128K */
+	c->blocks = vmalloc(sizeof(struct jffs2_eraseblock) * c->nr_blocks);
 	if (!c->blocks)
 		return -ENOMEM;
 	for (i=0; i<c->nr_blocks; i++) {

kmalloc() is limited to 128K and the 128MB Flash needs more than twice that,

so I tried vmalloc() and it seems to be OK (at least with PPC 2.4.18 
patched for the new MTD code). Does anyone know if this change is safe?


More information about the linux-mtd mailing list